| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 32°F | 24°F | 1.7" |
| February | 17°F | 34°F | 25°F | 1.7" |
| March | 27°F | 46°F | 36°F | 2.5" |
| April | 37°F | 58°F | 46°F | 4.3" |
| May | 46°F | 69°F | 57°F | 3.5" |
| June | 57°F | 79°F | 67°F | 5.0" |
| July | 63°F | 84°F | 73°F | 3.7" |
| August | 63°F | 82°F | 72°F | 3.2" |
| September | 55°F | 75°F | 65°F | 2.9" |
| October | 44°F | 63°F | 53°F | 3.2" |
| November | 32°F | 51°F | 41°F | 2.4" |
| December | 21°F | 37°F | 28°F | 2.6" |
| Index | Franklin | Wisconsin | National |
| Air quality index | 44 | 69 | 42 |
| Pollution index | 17,168,000 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 254 |
| Days with moderate air quality | 108 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.160% |
| Carbon Tetrachloride | 0.050% |
| Lead | 0.160% |
| Mercury | 0.150% |
| City | Population | Air Quality Index | National Avg. |
| Mount Pleasant, WI | 27,008 | 39 | 22.0% |
| Racine, WI | 76,893 | 39 | 22.0% |
| Caledonia, WI | 25,182 | 39 | 22.0% |
| Wind Lake, WI | 5,407 | 39 | 22.0% |
| Waterford, WI | 5,520 | 39 | 22.0% |
| Franklin, WI | 36,013 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Marion, OH | 36,011 | 41 | 18.0% |
| West Kelowna, BC | 36,030 | n/a | |
| San Juan Capistrano, CA | 35,976 | 89 | 78.0% |
| Lauderdale Lakes, FL | 36,063 | 41 | 18.0% |
| Panama City, FL | 35,952 | 38 | 24.0% |
| Franklin, WI | 36,013 | 44 | 12.0% |
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